Compressor



Dec. 21 1926.

C. c. SPRELEN COMPRESSOR Filed oct. 31, 1924- riemen nee. 2i, ieee.. y

CHARLES o. SREEN. or nnTRorr, MICHIGAN, AssieNoR. BY lMissiveAssi:r'nvi/lEN'rs, 'ro xnLvINATon coRronA'rlON. or nnrrnorr. MIGHIGANA CORPORATION or wenn GAN..

Application filed ctobei' 81, 1924. Serial No. 747.0%.

This invention relates to compressors und hns specialreference to compressors such'ns :irc used 'l'or rci'rigcrnting machinery. The objects oil the invention are theprovisiono'f n new :ind improved constructionv of piston which shall enable. thc admission oi' the largest possible charge oi' gils lo the compressor :it euch stroke :ind hence produce the most oflicient operation; the provision of :i new und improved type'of inlet valve which'shiill produce n larger effective*opening,r with a smaller amount of movement than other valves; the provision of a vulve which shall open more easily :ind close more tightly then other piston valves; the provision of u. pisn ton and piston vulve of maximum simplicity and reliability; While further objects und advantages of the invention wiil become apparent as the description proceeds. In the drawings accompanying and forming sport of this application have shown i one of the many physical forms in which my .inventive idea can be embodied although it will be understood that these'drewings are intended to be merely illustrative of thegeneral principles of my invention and not to be exhaustive of its detailed application. Fig. 1A is a longitudinal sectional vic-W of the cylinder containing'the piston n'nd'pist'on 30. valve of my invention; Fig. 2 is en enlarged sectional view oi the piston shown in Fig. l; Fig. 3 is a top plan view of the'jpiston drawnl to reduced seele, the valve member and its. securing device being limited; Fig-4 is n top plan view of a, complete piston shown in Fig. 2 including its valves. v

Describing the parts by reference characiers appearing on the drawing, l denotes the outer shell of n compressor cylinder,

e@ cylinder sleeve tightly secured therein initl spaced therefrom to define :i gus passage 3, 4

:i cylinder head or end closure, and 5 i1 cap member from which leeds the pipe G. Re lciiprocahly mounted inside the sleeve 2 is n .45 piston 8 sui tnbly articulated oy means of the pitman 9 to a crank '10. This piston is formed :itthe end opposite the crankwith e lint head 11 pierced nt the center 'by :i threaded socket 12 adapted for the reception of the tillistcr-hend screw 13, this socket heine;

surrounded by :i pnir of concentric uninterrupted flanges 14 constituting :1 sont for the piston vulve 15. This valve is annular in shape and is best made of very thin sheet receivin metal :u curiitoly .ground to :i fist surface, 55 -Y the tips ot the flanges i4 being smoothly dressed to nmkc :i tight lit thermvith. The vnlvc held in proper relation to the valve' sont by ineens of e suitable keeper, one foren of-wliic'h is shown in Fig. 2. The essentiels .9 of this keeper are that it should possess :i guiding portion lo' loosely surroimilcd by the vnl-ve disk, and :i interni-fluege l'( sullicient ly spaced from' the iienges 14 to permit :i limited lift of the vulve. YWhen the keeper is made seperate from the screw as shown in Fig. 2 it. is made with e bore i8 for the screw counterbored for the screw heed. 'The exterior nl the keeper is made plein nssliown zit 19.. ln order to'prevent rotation of the 70 keepeig'n dewel pin 2G 'inset in the piston heed is preferably employed, and this, in combination with a common split Washer 21. beneath the heed of the screw, holds the parte tightly against accidental nnscrewing. T he cylinder bead l is 'formed opposite the' center of, the cylinder with a bore 22 snugly the cess 19,' and the ed'ecent portion of t e closure is recessed as s own at 23 for the reception of the tieng 1?,.tlius en s@ abling the piston 'to move completely to the end of the cylinder and eiect substantially. all the gas therefrom.

Between the flanges 'lthe piston heed is formed with an annuler recess shown, sit 212.35

and into this recess open c lurality of gas inlet passages 25. `When a s eeve type cy1inder is employed as shown in Fig. l1 the passages 25 preferably open 'into an annuler duct 26 formed in the head of the piston, im this duct communicating by means of 'ports l 274-27 with e shallow external annular recess 28 formed between the two ends of the piston. lBetween the piston head ll sind the opper end of this recess the piston is 4formed with suitable groove-s 39 for .the usual-piston rings and below' this groovetl'ie exterior is preferably formed with n cylinV dricel land '31 ,which engages the cylinder Wall in steadying relation. When'this Well'm0 i vconsists of i1 sleevens shown in Fig. '1 it is formed at a suitable height with one or; morel ports 32, 32 which' et all times establish coinw municetion between the annuler space 3 and tbe-recess 28. The gas to be compressed is uw admitted to the space 3 isany suitable man- 'ner as by the lateral boss 331er by' duets 34 from the crank case,

"Having timsdescrlbed my invention what .from said sent, a screw extending thru said Iolaim s: I l keeper into the piston head5said keeper haw v10 In a compressor, a, piston having an :umuf ing a central socket for the reception of the lar valve seat, an 'annularvui've adzlptedlo screw head,' and. a lock Washer between .will 5 engage saidseat, a keeper having a guiding keeperend screw head.

. portion raversing the hole in s'aid valve and In testimony whereof, I hereunto aix my i having a lateral flange overhangng said signatuz'e. valve in a position to limit its displacement CHARLES C SPREENL 

